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Dibenzopyrenes are a group of high molecular weight polycyclic aromatic hydrocarbons with the molecular formula C 24 H 14.There are five isomers of dibenzopyrene which differ by the arrangement of aromatic rings: dibenzo[a,e]pyrene, dibenzo[a,h]pyrene, dibenzo[a,i]pyrene, dibenzo[a,l]pyrene, and dibenzo[e,l]pyrene.
The ubiquitous compound can be found in coal tar, tobacco smoke and many foods, especially grilled meats. The substance with the formula C 20 H 12 is one of the benzopyrenes, formed by a benzene ring fused to pyrene. Its diol epoxide metabolites, more commonly known as BPDE, react with and bind to DNA, resulting in mutations and eventually cancer.
Ring-closing metathesis (RCM) is a widely used variation of olefin metathesis in organic chemistry for the synthesis of various unsaturated rings via the intramolecular metathesis of two terminal alkenes, which forms the cycloalkene as the E-or Z-isomers and volatile ethylene.
In non-basic aromatic rings the lone pair of electrons of the nitrogen atom is delocalized and contributes to the aromatic pi electron system. In these compounds the nitrogen atom is connected to a hydrogen atom. Examples of non-basic nitrogen-containing aromatic rings are pyrrole and indole. Pyrrole contains a lone pair that is part of the pi ...
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Dapivirine (DPV) Ring is an antiretroviral vaginal ring pioneered by the International Partnership for Microbicides (IPM) pending for regulatory review. It is designed as a long-acting form of HIV prevention for at-risk women, particularly in developing nations such as sub-Saharan Africa. IPM has rights to both the medication and the medical ...
The vaginal ring does not offer protection against all sexually transmitted infections. [11] The dapivirine vaginal ring (DPV-VR) is a relatively recent type of vaginal ring that reduces the risk of acquiring HIV during vaginal sex, with further research attempting to create a contraceptive and HIV preventative vaginal ring. [37]
The 2025 edition of Genesis was a professional wrestling pay-per-view (PPV) event produced by Total Nonstop Action Wrestling (TNA). It took place on January 19, 2025, at the Curtis Culwell Center in Garland, Texas.
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